Accession Number : ADA198086

Title :   Condensation Polymers with Controlled Structure.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Meyer, W R ; Gentile, F T ; Suter, U W

PDF Url : ADA198086

Report Date : 13 Jul 1988

Pagination or Media Count : 13

Abstract : Wholly aromatic amides (aramides) represent a class of polymers of exceptional technological importance. Fibers with high mechanical strength and thermal resistance, obtained from nematic solutions of these polymers, are at present employed in a variety of industrial applications requiring extraordinary performances. As stated in our last report, this project's objective is to investigate the effects of constitutional isomerism in aramides arising when non-symmetric substituents are introduced into the main chain. We tried to solve the problem of determination of the polymers' structural regularity in two independent ways. On one hand, we calculated expected values for the order parameter s for all the compounds we synthesized applying the theory constitutional isomerism. On the other hand we tried to determine the structural order of our polymers directly through nuclear magnetic resonance. (JES)

Descriptors :   *POLYMERS, AMIDES, AROMATIC COMPOUNDS, CHAINS, CONDENSATION, CONTROL, HIGH STRENGTH, INDUSTRIES, LIQUID CRYSTALS, NUCLEAR MAGNETIC RESONANCE, PARAMETERS, STRENGTH(MECHANICS), STRUCTURAL PROPERTIES, THERMAL RESISTANCE

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE